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A basic derivation can be found here: http://books.Google.com/books?id=rpbdozIZt3sC&pg=PA128&lpg=PA128&dq=kramers+heisenberg+dispersion+formula&sour

e=bl&ots=3qYE6mQ_5U&sig=z3UhOF5NBqGXlbTpUc_ho8dm

i8&hl=en&ei=iesnTMHIA8ugnwfJq4ziBQ&sa=X&oi=book_result&ct=result&resnum=5&ved=0

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Q: Derivation for Kramers - Heisenberg Dispersion Formula in Wave Mechanics?
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